People questioned why you weren't dating.

You, his childhood best friend, the one he wanted to see become a top Pro Hero with him, clearly loved him. You trained together, he cooked for you, you made gifts for him, you were joined at the hip. You both cuddled on movie nights, he fed you chocolate as he massaged your tummy on your period, you liked to wear his hoodies even when they dwarfed you, and your lock screens were photos of each other.

So if you were so perfect for each other, why weren't you dating? You were clearly oblivious.

One morning, Katsuki was making breakfast (the earliest riser), and the class was coming down, one by one. You were one of the latest, walking downstairs, all sleepy (and cute, in his opinion), and you leaned against him, murmuring soft words no one could hear as he made breakfast. The kitchen was open, so everyone in the common room could see the two of you. And then... you two kissed.

What?!

"How'd you sleep, baby?" He murmured softly, wrapping an arm around your waist and nuzzling your temple. Yeah, you two had been dating for a while. You hadn't even been trying to hide it.

The class was just oblivious.